package com.wwj.aspect;


//自定义切面类,实现公共字段自动填充


import com.wwj.annotation.AutoFill;
import com.wwj.annotation.enumeration.OperationType;
import com.wwj.common.constant.AutoFillConstant;
import com.wwj.common.context.BaseContext;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    //切入点
    @Pointcut("execution(* com.wwj.mapper.*.*(..)) && @annotation(com.wwj.annotation.AutoFill)")
    public  void  autoFillPointCut(){
    }

    //定义前置通知
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint)  {
        log.info("开始进行公共字段自动填充");
        //获取当前被拦截方法上的数据库操作类型
        MethodSignature signature =(MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value();//获得数据库操作类型

        //获取被拦截方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length==0){
            return;
        }
        Object entity=args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();


        //根据不同操作类型为对应属性通过反射赋值
        if(operationType ==  OperationType.INSERT){
            try{
                //为公共字段赋值
                Method setCreateTime =
                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser =
                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime =
                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);

                Method setUpdateUser =
                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            }catch (Exception e) {
                e.printStackTrace();
            }



        } else if (operationType == OperationType.UPDATE) {
            try{
                //为公共字段赋值

                Method setUpdateTime =
                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);

                Method setUpdateUser =
                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值

                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            }catch (Exception e) {
                e.printStackTrace();
            }
        }


    }

}
